抄録
Kelp forests are important in coastal ecosystems as primary producers and
habitat for marine organisms. However, recent global warming has been
inducing reductions of kelp forests in various parts of the world. This
study investigated high-temperature tolerance of a representative kelp
forest constituent
Eisenia bicyclis collected from southern edge (Itoshima, Fukuoka
Prefecture) and central (Tateyama, Chiba Prefecture) population. Adult
sporophytes collected from the fields and juvenile sporophytes derived
from gametophytes were used for the comparison. The sporophytes were
cultivated under different temperature conditions: 20, 22, 24, 26, 28 and
30 ℃. Then, the maximum quantum yield (Fv /Fm)
was measured using Imaging-PAM. The adult and juvenile sporophytes from
Fukuoka maintained significantly higher Fv /Fm
at 30 ℃ than those from Takeyama. This indicates that E. bicyclis
from southern population (Fukuoka) has high-temperature
tolerance.
